Permanent magnet synchronous motor shell and preparation method thereof

Abstract

The permanent magnet synchronous motor shell comprises a shell part arranged corresponding to a base, a machine body is arranged in the shell part, a mounting surface is formed on one side, corresponding to the base, of the shell part, a grounding unit is arranged on the shell part corresponding to the mounting surface, and the grounding unit is connected with the base. A shielding layer is arranged on the surface of the shell, the shielding layer is connected with the grounding unit, a damping layer located in the shell is arranged on the shielding layer, and a sound absorption layer is arranged on the damping layer. According to the invention, through electromagnetic shielding of the shielding layer, vibration energy dissipation of the damping layer, sound wave absorption of the sound absorption layer and electrical safety guarantee of the grounding unit, the shielding effect of the shell on the aspects of overall noise, electromagnetic interference and electromagnetic shielding of the motor is remarkably improved; the motor equipped with the housing can be widely applied to complex industrial equipment with high processing precision and low interference requirements, and is especially suitable for submicron precision manufacturing scenes.

Description

Technical Field

[0001] The present invention relates to the field of motor accessories, and in particular to a permanent magnet synchronous motor housing and a preparation method thereof. Background Art

[0002] Permanent magnet synchronous motors use the magnetic field generated by permanent magnets to achieve high-efficiency rotation through the interaction between the rotating magnetic field generated by the current and the rotor permanent magnets. Its advantages include high power density, high efficiency, good dynamic response, etc., and it is suitable for applications with extremely high performance requirements.

[0003] In the prior art, when permanent magnet synchronous motors are used in situations where extremely high processing precision is required, such as on sub-micron precision equipment, the motor housing has significant deficiencies in noise reduction, anti-electromagnetic interference and electromagnetic shielding. During the application process, the motor housing of the permanent magnet synchronous motor fails to effectively isolate the mechanical and electromagnetic noise generated. These noises not only affect the working environment, but also interfere with the signals of the control system and sensors, resulting in data distortion and reduced processing precision. In addition, the material and structural design of the motor housing lack effective shielding against external electromagnetic interference, resulting in significantly reduced stability and reliability of the equipment in a strong electromagnetic environment.

[0004] Therefore, a permanent magnet synchronous motor housing and a preparation method thereof are proposed to solve the problem that the above-mentioned motor housing has significant deficiencies in noise reduction, anti-electromagnetic interference and electromagnetic shielding. Summary of the invention

[0005] The object of the present invention is to provide a permanent magnet synchronous motor housing and a preparation method thereof, so as to solve the problem that the motor housing has significant deficiencies in noise reduction, anti-electromagnetic interference and electromagnetic shielding.

[0006] To achieve this object, the present invention adopts the following technical solutions: A permanent magnet synchronous motor housing comprises a shell member arranged corresponding to a base, an organic body being arranged inside the shell member, a mounting surface being formed on one side of the shell member corresponding to the base, a grounding unit being arranged on the shell member corresponding to the mounting surface, and the grounding unit being connected to the base, a shielding layer being arranged on the surface of the shell member, the shielding layer being connected to the grounding unit, a damping layer being arranged inside the shell member on the shielding layer, and a sound absorbing layer being arranged on the damping layer.

[0007] The mounting surface is provided with a plurality of grooves at equal intervals, and grounding screws are arranged in the grooves. The shell is provided with threaded holes corresponding to the grounding screws, and the grounding screws are threadedly connected in the threaded holes. The grounding screws are connected to the grounding unit, and the grounding screws are also connected to the shielding layer.

[0008] The grounding unit includes an abutment plate, a connecting column and an assembly plate. The abutment plate abuts against the inner wall of the groove. The assembly plate is arranged in the groove. There are four connecting columns, and the connecting columns are fixed between the assembly plate and the abutment plate. A through hole for a grounding screw is opened in the abutment plate, and the grounding screw abuts against the abutment plate.

[0009] Copper wires are connected between two of the assembly boards that are adjacent in the horizontal and vertical directions. An installation groove is provided on the installation surface corresponding to the copper wire, and the installation groove is communicated with the groove.

[0010] The abutment plate, the connection column and the assembly plate are all made of copper, and the cross section of the assembly plate is circular.

[0011] The shell is made of aluminum alloy, and its wall thickness is 5 to 8 mm; the shielding layer is one of silver plating, copper plating, and conductive aluminum coating, and its spraying thickness is 30 to 50 microns; the damping layer is one of EPDM rubber, chloroprene rubber, and polypropylene, and its spraying thickness is 5 to 10 mm; the sound-absorbing layer is one of polyurethane foam, glass fiber sound-absorbing cotton, and high-density fiberboard, and its spraying thickness is 5 to 8 mm.

[0012] A method for preparing a permanent magnet synchronous motor housing, applied to the above-mentioned permanent magnet synchronous motor housing, comprises the following steps: Step 1: After obtaining the shell by precision CNC machining of aluminum alloy, the surface of the shell is sandblasted, and then a shielding layer is deposited on the surface of the shell by PVD technology; Step 2: After the damping material is prepared into a damping coating, the damping coating is evenly sprayed on the shielding layer on the inner surface of the shell twice by a pneumatic spraying device, and the damping layer is obtained after it is solidified; Step 3: first cut the sound-absorbing material according to the internal shape of the shell, and apply a high-temperature resistant adhesive on the damping layer, and then stick the cut sound-absorbing material on the damping layer, and obtain the sound-absorbing layer after it is cured.

[0013] In the first step, when the shell is sandblasted, its roughness is less than Ra0.8; In the first step, the shielding layer is deposited in a vacuum environment, the pressure is controlled at 10^-3Pa, and the deposition rate is 0.5 micrometers / minute.

[0014] In the second step, the damping coating is mixed with the conductive particles and then sprayed on the shielding layer on the inner surface of the shell, and then the damping coating is cured into a damping layer through a hot pressing process; Among them, the ratio of damping coating to conductive particles is 95% to 90% and 5% to 10%; the conductive particles are copper powder, or graphene, or carbon nanotubes; the ambient temperature during spraying is 20 to 25°C, and the humidity is less than 60%.

[0015] In the third step, after coating the sound-absorbing material of the polyurethane foam with a high-temperature resistant adhesive, the porous aluminum plate is pressed onto the polyurethane foam; wherein the hot pressing temperature is 60° C., the hot pressing pressure is 5 MPa, and the hot pressing time is 10 minutes; the thickness of the porous aluminum plate is 1 mm, the micropore diameter is 0.5 mm, and the opening rate is 30% to 50%.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The permanent magnet synchronous motor shell and its preparation method, through the electromagnetic shielding of the shielding layer, the vibration energy dissipation of the damping layer, the sound wave absorption of the sound-absorbing layer and the electrical safety guarantee of the grounding unit, the shielding effect of the shell on the overall noise, electromagnetic interference and electromagnetic shielding of the motor can be significantly improved. At the same time, the materials and designs at various levels on the shell cooperate with each other to form a comprehensive noise reduction and electromagnetic compatibility system, so that the motor equipped with the shell can be widely used in complex industrial equipment with high requirements for processing accuracy and low interference, especially suitable for sub-micron precision manufacturing scenarios, to ensure stable and efficient operation of the motor in complex environments.

[0017] 2. The permanent magnet synchronous motor housing and its preparation method can achieve multiple noise reduction effects by setting a damping layer and a sound-absorbing layer. The damping layer converts mechanical vibration into heat energy by absorbing and dissipating vibration energy, reduces the vibration amplitude and weakens the noise generated by vibration propagation. The sound-absorbing layer effectively dissipates sound energy by absorbing the reflection and scattering of sound waves. With the cooperation of the damping layer and the sound-absorbing layer, the noise is further reduced.

[0018] 3. The permanent magnet synchronous motor shell and its preparation method use aluminum alloy materials to prepare the shell and combine PVD technology to deposit the shielding layer, making the shell lighter but not reducing the strength. It is especially suitable for weight-sensitive high-precision equipment. At the same time, the shielding layer, damping layer and sound-absorbing layer are deeply integrated to realize a multifunctional integrated structure of electromagnetic shielding, vibration reduction and noise reduction, thereby improving space utilization.

[0019] 4. The permanent magnet synchronous motor housing and its preparation method provide a low-impedance grounding path through the cooperation of the grounding unit and the copper wire, effectively disperse the electromagnetic interference signal, reduce the risk of current load and potential increase at the grounding point, enhance the equipment's anti-electromagnetic interference capability, and ensure the stability of the grounding system performance. At the same time, multiple strands of copper wire increase the total conductive surface area, reduce the conductive resistance, and reduce the skin effect of high-frequency current, so that high-frequency current can be conducted more efficiently, thereby effectively suppressing the propagation of high-frequency electromagnetic interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic cross-sectional structural diagram of the shell member in the present invention; Figure 3 is a schematic diagram of the internal structure of the groove in the present invention; Figure 4 It is a front view structural schematic diagram of the groove in the present invention; Figure 5 It is a schematic diagram of the connection structure between the connection column and the assembly plate in the present invention; Figure 6 It is a schematic diagram of the disassembly structure of the abutment plate and the assembly plate in the present invention; Figure 7 It is a front view structural schematic diagram of the assembly plate in the present invention; Figure 8 It is a schematic diagram of the connection structure between the connecting column and the copper wire in the present invention.

[0023] Illustrations: 1. Shell; 11. Threaded hole; 12. Grounding screw; 13. Shielding layer; 14. Damping layer; 15. Sound-absorbing layer; 16. Mounting surface; 2. Machine body; 3. Grounding unit; 31. Groove; 32. Connecting column; 33. Copper wire; 34. Mounting groove; 35. Abutment plate; 36. Assembly plate; 37. Copper wire. DETAILED DESCRIPTION

[0024] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0026] Embodiment 1: See also Figure 1-Figure 6 In this embodiment, a permanent magnet synchronous motor housing includes a shell 1 arranged corresponding to a base, an organic body 2 is arranged in the shell 1, a mounting surface 16 is formed on one side of the shell 1 corresponding to the base, a grounding unit 3 is arranged on the shell 1 corresponding to the mounting surface 16, and the grounding unit 3 is connected to the base, a shielding layer 13 is arranged on the surface of the shell 1, the shielding layer 13 is connected to the grounding unit 3, a damping layer 14 located in the shell 1 is arranged on the shielding layer 13, and a sound absorbing layer 15 is arranged on the damping layer 14.

[0027] When in use, the motor is connected to the base through the shell 1, and when connected to the base, the grounding unit 3 is also connected to the base and the grounding system. When the motor is working, the shielding layer 13 arranged on the shell 1 forms a closed electromagnetic shielding body on the shell 1 to prevent interference from external electromagnetic fields and leakage of internal electromagnetic radiation, thereby reducing the impact of electromagnetic interference generated during motor operation on surrounding electronic equipment. At the same time, under the action of the grounding unit 3, the shielding layer 13 and the base are connected to the grounding system, and the electromagnetic radiation absorbed by the shielding layer 13 is guided to the ground, thereby reducing interference with the surrounding environment. In addition, when the motor is working, the damping layer 14 will absorb and dissipate vibration energy. When the motor is working, the damping layer 14 will be deformed due to force, and the vibration energy will be converted into heat energy through internal friction, thereby reducing the vibration amplitude. When the vibration wave generated by the motor passes through the damping layer 14, the internal molecular movement generates friction, resulting in energy loss, weakening the audio signal intensity, thereby reducing noise. Under the action of the sound-absorbing layer 15, the sound wave generated by the motor will be reflected and scattered after passing through the sound-absorbing layer 15, and the sound energy will be dissipated in the sound-absorbing layer 15, thereby further achieving the noise reduction effect.

[0028] It should be noted that the shell 1 is an aluminum alloy, and its wall thickness is 5 to 8 mm; the shielding layer 13 is one of a silver plating, a copper plating, and a conductive aluminum coating, and its spraying thickness is 30 to 50 microns; the damping layer 14 is one of EPDM rubber, chloroprene rubber, and polypropylene, and its spraying thickness is 5 to 10 mm; the sound-absorbing layer 15 is one of polyurethane foam, glass fiber sound-absorbing cotton, and high-density fiberboard, and its spraying thickness is 5 to 8 mm.

[0029] Specifically, the shell 1 has a wall thickness of 6 mm; the shielding layer 13 is a silver-plated layer with a spray thickness of 40 μm; the damping layer 14 is chloroprene rubber with a spray thickness of 7 mm; and the sound-absorbing layer 15 is polyurethane foam with a spray thickness of 5 mm.

[0030] Embodiment 2: The basic content is the same as that of Example 1, except that: See also Figure 3-Figure 8 In this embodiment, a plurality of grooves 31 are formed on the mounting surface 16 at equal intervals, a grounding screw 12 is disposed in the groove 31, a threaded hole 11 is formed on the shell 1 corresponding to the grounding screw 12, the grounding screw 12 is threadedly connected in the threaded hole 11, the grounding screw 12 is connected to the grounding unit 3, and the grounding screw 12 is also connected to the shielding layer 13.

[0031] The grounding unit 3 includes an abutment plate 35, a connecting column 32 and an assembly plate 36. The abutment plate 35 abuts against the inner wall of the groove 31. The assembly plate 36 is arranged in the groove 31. There are four connecting columns 32, and the connecting columns 32 are fixed between the assembly plate 36 and the abutment plate 35. A through hole for the grounding screw 12 is opened in the abutment plate 35, and the grounding screw 12 abuts against the abutment plate 35.

[0032] During application, when the base and the shielding layer 13 are connected through the grounding unit 3, the grounding screw 12 is first separated from the threaded hole 11, and then the abutment plate 35 is moved into the groove 31 through the assembly plate 36 and the connecting column 32, and the abutment plate 35 is abutted against the inner wall of the groove 31, and the threaded hole 11 is aligned with the through hole, and then the grounding screw 12 is connected to the threaded hole 11, so as to fix the abutment plate 35 in the groove 31. After the abutment plate 35 is installed, the shell 1 is fixed on the base. At this time, the shielding layer 13 can be connected to the base through the assembly plate 36, the connecting column 32 and the abutment plate 35. After the motor is working, the grounding unit 3 provides a low-impedance path, which can guide excess current to the ground, prevent electrical failures and static electricity accumulation, ensure the safety of the equipment, and effectively guide the electromagnetic radiation absorbed by the shielding layer 13 to the ground, reducing interference with the surrounding environment.

[0033] Furthermore, a copper wire 33 is connected between two assembly plates 36 adjacent in the horizontal and vertical directions, and the diameter of the copper wire 33 is 2.5 mm. A mounting groove 34 is opened on the mounting surface 16 corresponding to the copper wire 33, and the mounting groove 34 is connected to the groove 31. The abutment plate 35, the connecting column 32 and the assembly plate 36 are all made of copper, and the cross-section of the assembly plate 36 is a circular ring.

[0034] When in use, the electromagnetic interference signal generated by the motor during operation is efficiently introduced into the base and grounding system through the shielding layer 13, the abutment plate 35, the connecting column 32, the assembly plate 36 and the copper wire 33 to prevent it from affecting other sensitive equipment. The electromagnetic interference can be dispersed to multiple grounding points through multiple assembly plates 36, reducing the current load and the risk of potential increase at a single grounding point. At the same time, the copper wire 33 can provide a low-impedance path for the shell 1 and the shielding layer 13 to reduce the propagation of common-mode electromagnetic interference, so that the common-mode interference signal will be quickly dissipated to the ground along the copper wire 33, thereby protecting the equipment. Through the combination of the copper wire 33 and the shielding layer 13, a complete shielding system is formed, which can effectively prevent external electromagnetic interference from entering the system and suppress the electromagnetic radiation inside the motor from propagating outward.

[0035] It should be noted that the copper wire 33 first needs to be connected to the base of the motor. The base is usually a direct contact point between the motor and the ground, which can provide a primary grounding path to ensure the consistency of the potential and avoid interference caused by potential differences. The copper wire 33 also needs to be connected to the external grounding system to ensure that the electromagnetic interference signal can eventually be discharged to the ground.

[0036] For details, please refer to Figure 7-Figure 8 The copper wire 33 includes a plurality of copper wires 37 and is composed of a plurality of copper wires 37 , and the ends of the plurality of copper wires 37 are connected to the inner side wall of the connecting column 32 .

[0037] It can be understood that the copper wires 37 further reduce the conductive resistance per unit cross-sectional area, ensuring efficient guidance and discharge of electromagnetic interference. The copper wires 37 provide a larger contact surface area, which can reduce the concentration effect of the grounding current, ensure uniform current distribution, and thus enhance the anti-electromagnetic interference capability. Under high-frequency conditions, the current skin effect will cause the current density on the conductor surface to increase. The copper wires 37 increase the total surface area of ​​the conductor, which can more effectively conduct high-frequency current, thereby reducing the propagation of high-frequency electromagnetic interference.

[0038] In actual use, the combination of several copper wires 37 has significant advantages in anti-electromagnetic interference performance. Its low impedance characteristics, flexibility, uniform current distribution and high-frequency performance can enhance the grounding effect, improve the stability and reliability of the motor, and make the motor suitable for complex equipment with high precision and low interference.

[0039] In another specific embodiment, the connecting column 32 is a hollow column filled with a thermally conductive material, a nano-scale conductive film is arranged on the outer side of the assembly plate 36, the assembly plate 36 is a double-layer composite plate, the assembly plate 36 includes two substrates and a flexible damping plate, the flexible damping plate is arranged between the two substrates, and a high thermal conductivity coating is arranged on the flexible damping plate, the high thermal conductivity coating is also connected to the substrate, a conductive coating is arranged on the outer side of the substrate, a plurality of copper wires 37 are spirally formed into a copper wire 33, and an insulating film is arranged on the outer side of the copper wire 37.

[0040] It should be noted that the assembly board 36 with a nano-conductive film and a double-layer composite plate structure can shield electromagnetic interference with higher frequencies and is suitable for multi-band interference environments of complex industrial equipment. At the same time, the assembly board 36 with a double-layer composite plate structure adds a flexible damping plate to make its overall structure more resistant to vibration, improve its impact resistance, and extend its service life. By arranging a thermally conductive material in the hollow connecting column 32, heat can be conducted from the shell 1 to the grounding system or the heat dissipation unit, so that local overheating caused by high-frequency interference can be quickly dissipated to avoid local heat accumulation caused by high-frequency electromagnetic waves.

[0041] Embodiment 3: The basic content is the same as that of Example 1, except that: A method for preparing a permanent magnet synchronous motor housing in this embodiment is applied to the above-mentioned permanent magnet synchronous motor housing, and comprises the following steps: Step 1: After obtaining the shell 1 by precision CNC machining of aluminum alloy, the surface of the shell 1 is sandblasted, and then a shielding layer 13 is deposited on the surface of the shell 1 by PVD technology; Step 2: After the damping material is prepared into a damping coating, the damping coating is evenly sprayed on the shielding layer 13 on the inner surface of the shell 1 twice by a pneumatic spraying device, and the damping layer 14 is obtained after it is solidified; Step 3: firstly cut the sound absorbing material according to the internal shape of the shell 1, and apply a high temperature resistant adhesive on the damping layer 14, and then adhere the cut sound absorbing material to the damping layer 14, and obtain the sound absorbing layer 15 after curing.

[0042] The shell 1 prepared by the above method allows the shielding layer 13 and the damping layer 14 to form an integrated structure through a tight transition, which not only realizes electromagnetic shielding, but also reduces vibration and noise. At the same time, under the joint action of the sound-absorbing layer 15 and the damping layer 14, sound absorption and vibration reduction complement each other, thereby improving the overall performance of the shell 1.

[0043] Furthermore, in the first step, when the shell 1 is sandblasted, its roughness is less than Ra0.8; in the first step, the shielding layer 13 is deposited in a vacuum environment, the pressure is controlled at 10^-3Pa, and the deposition rate is 0.5 microns / minute.

[0044] It should be noted that the roughness of the shell 1 surface is less than Ra0.8, which can increase the adhesion of subsequent coatings; the shielding layer 13 is deposited on the shell 1 through PVD technology, making the shell 1 lighter, which is particularly suitable for sub-micron precision equipment with strict requirements on structural weight. The inside and outside of the shell 1 are shielded at the same time, which improves the motor's ability to resist external electromagnetic interference and suppress internal electromagnetic leakage. At the same time, compared with the traditional mechanical installation of the shielding cover to achieve shielding, it avoids the problem of shielding gap or shielding performance attenuation caused by mechanical connection.

[0045] Furthermore, in the second step, the damping coating is mixed with the conductive particles and then sprayed on the shielding layer 13 on the inner surface of the shell 1, and then the damping coating is cured into the damping layer 14 through a hot pressing process; wherein the ratio of the damping coating to the conductive particles is 95% to 90% and 5% to 10%; the conductive particles are copper powder, or graphene, or carbon nanotubes; the ambient temperature during spraying is 20 to 25°C, and the humidity is less than 60%.

[0046] It should be noted that the conductive particles in the damping layer 14 enable it to have conductive properties while suppressing vibrations, thereby combining the functions of the shielding layer 13 into one, achieving deep integration of shielding and vibration reduction functions, further reducing the weight of the shell 1, and improving space utilization. At the same time, during hot pressing, by applying pressure, the conductive particles can form a uniform network structure in the damping layer 14, ensuring that the coating has consistent conductive properties over the entire surface, which not only enhances the shielding effect of the coating, but also avoids local shielding weaknesses caused by uneven distribution of conductivity. The hot pressing molding process makes the interface between the coating and the shell 1 tighter, reducing gaps or delamination at the interface, thereby improving the reliability of the coating in a long-term vibration environment.

[0047] Furthermore, in the third step, after coating the sound-absorbing material of the polyurethane foam with a high-temperature resistant adhesive, the porous aluminum plate is pressed onto the polyurethane foam; wherein the hot pressing temperature is 60°C, the hot pressing pressure is 5 MPa, and the hot pressing time is 10 minutes; the thickness of the porous aluminum plate is 1 mm, the micropore diameter is 0.5 mm, and the opening rate is 30% to 50%.

[0048] It can be understood that the porous structure in the polyurethane foam material causes multiple scattering and reflection of sound waves after they enter, thereby absorbing sound energy.

[0049] It should be noted that the porous aluminum plate and the polyurethane foam are pressed together to achieve multi-layer resonant sound absorption, enhance the absorption effect of medium and low frequency noise, expand the suppression range of the sound-absorbing layer 15 on medium and low frequency noise, and enhance the synergistic effect of vibration reduction and sound absorption. When the sound wave passes through the porous aluminum plate, due to the effect of the pore size and the opening rate, a certain acoustic impedance is generated when the sound wave is incident. When the sound wave passes through the micropores, part of the sound energy is converted into heat energy and dissipated due to friction and viscosity effects.

[0050] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A permanent magnet synchronous motor housing, comprising a housing (1) arranged corresponding to a base, characterized in that: An organism (2) is arranged inside the shell (1); a mounting surface (16) is formed on one side of the shell (1) corresponding to the base; a grounding unit (3) is arranged on the shell (1) corresponding to the mounting surface (16); and the grounding unit (3) is connected to the base; a shielding layer (13) is arranged on the surface of the shell (1); the shielding layer (13) is connected to the grounding unit (3); a damping layer (14) located inside the shell (1) is arranged on the shielding layer (13); and a sound absorbing layer (15) is arranged on the damping layer (14).

2. A permanent magnet synchronous motor housing according to claim 1, characterized in that: A plurality of grooves (31) are formed at equal intervals on the mounting surface (16), a grounding screw (12) is disposed in the groove (31), a threaded hole (11) is formed on the shell (1) corresponding to the grounding screw (12), the grounding screw (12) is threadedly connected in the threaded hole (11), the grounding screw (12) is connected to the grounding unit (3), and the grounding screw (12) is also connected to the shielding layer (13).

3. A permanent magnet synchronous motor housing according to claim 2, characterized in that: The grounding unit (3) comprises an abutment plate (35), a connecting column (32) and an assembly plate (36); the abutment plate (35) abuts against the inner side wall of the groove (31); the assembly plate (36) is arranged in the groove (31); there are four connecting columns (32), and the connecting columns (32) are fixed between the assembly plate (36) and the abutment plate (35); a through hole for a grounding screw (12) is provided in the abutment plate (35), and the grounding screw (12) abuts against the abutment plate (35).

4. A permanent magnet synchronous motor housing according to claim 3, characterized in that: A copper wire (33) is connected between two assembly plates (36) that are adjacent in the horizontal and vertical directions. A mounting groove (34) is provided on the mounting surface (16) corresponding to the copper wire (33), and the mounting groove (34) is in communication with the groove (31).

5. A permanent magnet synchronous motor housing according to claim 3, characterized in that: The abutment plate (35), the connection column (32) and the assembly plate (36) are all made of copper, and the cross-section of the assembly plate (36) is circular.

6. A permanent magnet synchronous motor housing according to claim 1, characterized in that: The shell (1) is made of aluminum alloy, and its wall thickness is 5 to 8 mm; the shielding layer (13) is one of a silver plating layer, a copper plating layer, and a conductive aluminum coating layer, and its spraying thickness is 30 to 50 μm; the damping layer (14) is one of EPDM rubber, chloroprene rubber, and polypropylene, and its spraying thickness is 5 to 10 mm; the sound absorbing layer (15) is one of polyurethane foam, glass fiber sound absorbing cotton, and high-density fiberboard, and its spraying thickness is 5 to 8 mm.

7. A method for preparing a permanent magnet synchronous motor housing, characterized in that: The permanent magnet synchronous motor housing according to any one of claims 1 to 6 comprises the following steps: Step 1: After obtaining a shell (1) by precision CNC machining of aluminum alloy, the surface of the shell (1) is sandblasted, and then a shielding layer (13) is deposited on the surface of the shell (1) by PVD technology; Step 2: after the damping material is prepared into a damping coating, the damping coating is evenly sprayed twice on the shielding layer (13) on the inner surface of the shell (1) by means of a pneumatic spraying device, and after the damping coating is cured, a damping layer (14) is obtained; Step 3: firstly cut the sound absorbing material according to the internal shape of the shell (1), and apply a high temperature resistant adhesive on the damping layer (14), and then adhere the cut sound absorbing material to the damping layer (14), and after curing, obtain the sound absorbing layer (15).

8. A permanent magnet synchronous motor housing according to claim 7, characterized in that: In the first step, when the shell (1) is subjected to sandblasting, its roughness is less than Ra0.8; In the first step, the shielding layer (13) is deposited in a vacuum environment, the pressure is controlled at 10^-3Pa, and the deposition rate is 0.5 micrometers / minute.

9. A permanent magnet synchronous motor housing according to claim 7, characterized in that: In the second step, the damping coating is mixed with the conductive particles and then sprayed onto the shielding layer (13) on the inner surface of the shell (1), and then the damping coating is cured into a damping layer (14) through a hot pressing process; Among them, the ratio of damping coating to conductive particles is 95% to 90% and 5% to 10%; the conductive particles are copper powder, or graphene, or carbon nanotubes; the ambient temperature during spraying is 20 to 25°C, and the humidity is less than 60%.

10. A permanent magnet synchronous motor housing according to claim 7, characterized in that: In the third step, after coating the sound-absorbing material of the polyurethane foam with a high-temperature resistant adhesive, the porous aluminum plate is pressed onto the polyurethane foam; wherein the hot pressing temperature is 60° C., the hot pressing pressure is 5 MPa, and the hot pressing time is 10 minutes; the thickness of the porous aluminum plate is 1 mm, the micropore diameter is 0.5 mm, and the opening rate is 30% to 50%.

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